Power Supply Board Section - Panasonic KX-FLB758RU Service Manual

7.14. POWER SUPPLY BOARD SECTION

This power supply board uses the switching regulator method.
AC
Input
Input
Rectifier
Circuit
CN101 Circuit
A-B Voltage Wave Form
0
C-D Voltage Wave Form
0
E-F
G-H Voltage Wave Form
0
Heat Lamp
[Input Circuit]
The input current goes into the input rectifier circuit through the filter circuit. The filter circuit decreases the noise voltage and
the noise electric field strength.
[Rectifier Circuit]
The input current is rectified by D101~ D104 and charges C106 to make DC voltage. Then it supplies power to the converter
circuit.
[Kick-on voltage circuit]
Bias is applied to the Q101 gate via this circuit when the AC power is turned on and Q101 begins operating.
Block Diagram
A
+
C106
-
Kick-on
R110
B
Voltage
Circuit
R111
Triac
SCR101
CN102
T101
Surge
absorber
Converter circuit
Circuit
C
Q101
Surge
absorber
D
circuit
Control
Circuit
E
IC101
O.C.L
Over voltage
F
Error Detecting
Circuit
Phot Triac
Coupler PC102
203
G
24V
Output
Circuit
5V
Output
Circuit
IC202
H
PC101
KX-FLB758RU
24V
PGND
5V
DGND
HTRON